In addition to Java 8 support (announced publicly today by Oracle) IntelliJ IDEA 13.1 brings minor improvements to most parts of the IDE, including the UI, frameworks support, and tools integration.
At the same time the update offers a number of completely new features:
▪ Sublime Text style multiple selection
▪ Postfix code completion for Java
▪ Built-in debugger for JDK 8’s Nashorn
▪ Chronon “back-in-time” Java debugger (Ultimate)
▪ Better performance for Spring projects that heavily use XML (Ultimate)
▪ Version control improvements: Amend commits for Mercurial, GitHub two-factor authentication, enhanced Log and Diff viewers, and more.
▪ OpenShift debugger (Ultimate)
▪ Improved support for AngularJS and Spy-js (Ultimate)

Notable changes in IntelliJ IDEA 13.1
• Spring Open API
• Spring: performance improvements for projects with many/big XML config files
• Multiple selections in editor
• Configurable Web Browsers
• Structural Search can find Java 8's lambda expressions, method handles & default methods
• Plugins configuration redesign
• Support Windows/Linux HiDPI devices via -Dis.hidpi=true
• Editor: code blocks automatically indented after closing a curly brace
• 2 new Java inspections:
• Interface may be annotated @FunctionalInterface
• Implicit usage of the platform's default charset
• Postfix completion
• IDEA-99943 Allow to filter thread dump by a word in stacktrace
• javax.annotation.ParamatersAreNonnullByDefault supported for data flow analysis
• OpenShift debug
• Diff:
• Go To Source from older diff contents.
• Option to disable sync scrolling.
• Option to choose diff highlighting mode: by word, by line or no diff highlighting.
• Mercurial:
• Amend commit.
• Support unnamed heads in the "Branches" menu.
• Groovy
• Highlighting for overloaded binary operators.

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